How To Clean Window Sills Before Painting. If you schedule regular window cleanings every three or six months, it can help to give timber surfaces and joinery finishes a good wipe down using a soft sponge or cleaning cloth dampened with water and a mild soap or detergent on a more regular basis. To properly clean wooden windows frames:
This is a great time to carefully clean screens too. If you are painting new surfaces, prime first, then caulk. When you have finished, clean the brushes using some white spirit in a sealable jar.
After you’ve painted 11 inches or so of trim, lift the paint shield away and wipe its blade on a rag before repositioning it along the next section of window trim.
2 remove any flaking paint using a wire brush or rough grit sandpaper. 2 or 3 clean soft cloths. Make sure you’ve removed all of the dust and anything else that is on the top layer of grime. When you have finished, clean the brushes using some white spirit in a sealable jar.